21634927043 has 16 divisors (see below), whose sum is σ = 22472230560. Its totient is φ = 20803910400.

The previous prime is 21634927033. The next prime is 21634927057. The reversal of 21634927043 is 34072943612.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21634927043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21634927033) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8580623 + ... + 8583143.

It is an arithmetic number, because the mean of its divisors is an integer number (1404514410).

Almost surely, 2^21634927043 is an apocalyptic number.

21634927043 is a deficient number, since it is larger than the sum of its proper divisors (837303517).

21634927043 is a wasteful number, since it uses less digits than its factorization.

21634927043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3638.

The product of its (nonzero) digits is 217728, while the sum is 41.

The spelling of 21634927043 in words is "twenty-one billion, six hundred thirty-four million, nine hundred twenty-seven thousand, forty-three".